Voltage Limiter Circuit for Pixel Driving Transistor
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Solution Overview
Problem
Electro-optical devices with transistors formed on silicon substrates face the risk of transistor damage due to high voltages exceeding their withstand voltage, especially when reducing size and achieving high definition, as the voltage limiting mechanisms in existing technologies are inadequate.
Innovation Solution
Incorporating a voltage limiter circuit, such as a diode-connected transistor or diode element, in series with the driving transistor and light-emitting element to limit the voltage between the drain and source of the driving transistor to a predetermined value, ensuring the transistor operates within safe voltage limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pixel circuits are formed over a silicon substrate to reduce size and achieve high definition, then the size of each transistor can be reduced, but the withstand voltage of the transistor becomes lower, resulting in the risk of transistor breakdown
Solution Approach 1:
A voltage limiter circuit is introduced as an intermediary component between the power supply and the driving transistor. This circuit includes a limiter transistor connected in parallel with the light-emitting element, which acts as a mediator to clamp the voltage between the drain and source of the driving transistor to a predetermined safe level, preventing voltage spikes from damaging the transistor while allowing the transistor to maintain its small size on the silicon substrate
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents transistor damage by maintaining the voltage within safe limits, even when power voltage changes, allowing for smaller, high-definition electro-optical devices without compromising transistor integrity.
Implementation Method 1
the voltage limiter circuit performs voltage limiting in such a way as to ensure that a voltage between the drain of the driving transistor and the source of the driving transistor does not exceed a predetermined value
Implementation Method 2
the light-emitting element emits light at a luminance that is dependent on an electric current that flows between the source of the driving transistor and a drain of the driving transistor
Data Source
AI summary
A pixel circuit 110 includes a driving transistor, a light-emitting element, and a voltage limiter circuit. The transistor and the light-emitting element are connected in series between power supply. The transistor allows an electric current that is dependent on a voltage between its gate and source to flow through the light-emitting element. The light-emitting element emits light at a luminance that is dependent on an electric current that flows between two terminals. The voltage limiter circuit performs voltage limiting in such a way as to ensure that a voltage between the drain of the transistor and the source thereof does not exceed a predetermined value.